> I just copied the code of the default page and changed the text as I needed a different language and added one more link, to be clickable.
Yeah, that's not the way to do it, I'm afraid.
The launch page is responsible for passing subject and group ids on to the script. There are two functions in the page for this purpose,
When using the default launch page, run on the millisecond servers, the server's data base takes care of subject and group ids, i.e. those functions will return a value from the respective database, and that is what wil be visible in in the source code.
What you did when copying the pages source is effectively hardcoding those values above. Your page now always returns "721755398" as the subject ID and always returns "1" as the group ID.
You need to fix that. You can either do things how they're intended to be done, i.e. a custom launch page that embeds the default launch page as an iframe, thereby keeping all its functionality intact. This is what you get when you click on "Download Launch Page" in the setting's summary:
var snum = Math.floor(Math.random() * 1000000000);